what is vulnerisation and what is photoperiodism

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Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. It occurs in plants and animals. Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods. They are classified under three groups according to the photoperiods: short-day plants, long-day plants, and day-neutral plants. Vernalisation is the process of accelerating the ability of the flowering in plants by exposing them to cold temperatures. In this technique, cold treatment is given especially to flower buds, seeds or seedlings. This type of process is mainly carried out for promoting early flowering in plants.

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